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//! Reactive Form example using FormState API
//!
//! Demonstrates:
//! - High-level FormState API with builder pattern
//! - Automatic reactive validation
//! - Password confirmation with matches()
//! - Focus management
//! - Form submission
//!
//! Run with: cargo run --example reactive_form
use revue::patterns::form::FormState;
use revue::prelude::*;
struct ReactiveForm {
form: FormState,
message: Signal<String>,
}
impl ReactiveForm {
fn new() -> Self {
let form = FormState::new()
.field("name", |f| {
f.label("Name")
.placeholder("Enter your name")
.required()
.min_length(2)
.max_length(50)
})
.field("email", |f| {
f.email()
.label("Email")
.placeholder("user@example.com")
.required()
})
.field("password", |f| {
f.password()
.label("Password")
.placeholder("Min 8 characters")
.required()
.min_length(8)
})
.field("confirm", |f| {
f.password()
.label("Confirm Password")
.placeholder("Re-enter password")
.required()
.matches("password")
})
.build();
// Focus the first field
form.focus("name");
Self {
form,
message: signal(String::new()),
}
}
fn handle_input(&mut self, c: char) {
if let Some(name) = self.form.focused() {
let mut value = self.form.value(&name).unwrap_or_default();
value.push(c);
self.form.set_value(&name, &value);
}
}
fn handle_backspace(&mut self) {
if let Some(name) = self.form.focused() {
let mut value = self.form.value(&name).unwrap_or_default();
value.pop();
self.form.set_value(&name, &value);
}
}
fn submit(&mut self) {
if self.form.submit() {
let values = self.form.values();
self.message.set(format!(
"Submitted: {} ({})",
values.get("name").unwrap_or(&String::new()),
values.get("email").unwrap_or(&String::new())
));
self.form.reset();
self.form.focus("name");
} else {
self.message.set("Please fix validation errors".to_string());
}
}
fn handle_key(&mut self, key: &Key) -> bool {
match key {
Key::Char(c) if !c.is_control() => {
self.handle_input(*c);
true
}
Key::Backspace => {
self.handle_backspace();
true
}
Key::Tab => {
self.form.focus_next();
true
}
Key::BackTab => {
self.form.focus_prev();
true
}
Key::Enter => {
self.submit();
true
}
_ => false,
}
}
}
impl View for ReactiveForm {
fn render(&self, ctx: &mut RenderContext) {
let message = self.message.get();
let form_valid = self.form.is_valid();
let focused_name = self.form.focused();
let mut main_view = vstack().gap(1);
// Header
main_view =
main_view.child(
Border::panel()
.title("Reactive Form (FormState API)")
.child(
vstack()
.child(hstack().gap(2).child(Text::new("Status:")).child(
if form_valid {
Text::success("Valid - Ready to submit!")
} else {
Text::error("Please complete all fields")
},
))
.child(if !message.is_empty() {
Text::new(message).fg(Color::CYAN).bold()
} else {
Text::new("")
}),
),
);
// Render each field
for name in self.form.field_names() {
if let Some(field) = self.form.get(name) {
let is_focused = focused_name.as_deref() == Some(name);
let value = field.value();
let errors = field.errors();
let is_valid = field.is_valid();
let is_touched = field.is_touched();
let border = if is_focused {
Border::double().fg(Color::CYAN)
} else {
Border::single()
};
let status_icon = if value.is_empty() {
"○"
} else if is_valid {
"✓"
} else {
"✗"
};
let status_color = if value.is_empty() {
Color::rgb(100, 100, 100)
} else if is_valid {
Color::GREEN
} else {
Color::RED
};
// Mask password fields
let display_value = if field.field_type
== revue::patterns::form::FieldType::Password
&& !value.is_empty()
{
"*".repeat(value.len())
} else if value.is_empty() {
format!("({})", field.placeholder)
} else {
value.clone()
};
let mut field_view = vstack()
.child(
hstack()
.gap(1)
.child(Text::new(status_icon).fg(status_color))
.child(Text::new(&field.label).bold()),
)
.child(Text::new(&display_value).fg(if is_focused {
Color::YELLOW
} else if value.is_empty() {
Color::rgb(100, 100, 100)
} else {
Color::WHITE
}));
// Show errors only if touched or focused
if (is_touched || is_focused) && !value.is_empty() {
for error in errors {
field_view =
field_view.child(Text::error(format!(" → {}", &error.message)));
}
}
main_view = main_view.child(border.child(field_view));
}
}
// Controls
main_view = main_view.child(
Border::rounded().title("Controls").child(
vstack()
.child(
hstack()
.gap(2)
.child(Text::muted("[Type]"))
.child(Text::new("Enter text")),
)
.child(
hstack()
.gap(2)
.child(Text::muted("[Tab]"))
.child(Text::new("Next field")),
)
.child(
hstack()
.gap(2)
.child(Text::muted("[Shift+Tab]"))
.child(Text::new("Previous field")),
)
.child(
hstack()
.gap(2)
.child(Text::muted("[Enter]"))
.child(Text::new("Submit form")),
)
.child(
hstack()
.gap(2)
.child(Text::muted("[q]"))
.child(Text::new("Quit")),
),
),
);
// Feature highlights
main_view = main_view.child(
Border::success_box().title("FormState Features").child(
vstack()
.child(Text::success(
"Builder pattern: FormState::new().field(...).build()",
))
.child(Text::success(
"Auto validation: errors update on value change",
))
.child(Text::success(
"matches() validator for password confirmation",
))
.child(Text::info("→ Minimal boilerplate, maximum reactivity!")),
),
);
main_view.render(ctx);
}
fn meta(&self) -> WidgetMeta {
WidgetMeta::new("ReactiveForm")
}
}
fn main() -> Result<()> {
println!("Reactive Form Example (FormState API)");
println!("Demonstrates the high-level form API with automatic validation.\n");
let mut app = App::builder().build();
let form = ReactiveForm::new();
app.run(form, |event, form, _app| match event {
Event::Key(key_event) => form.handle_key(&key_event.key),
_ => false,
})
}